P34B4B Camshaft Position Actuator Temperature Sensor Circuit Bank 1
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P34B4 reports that the circuit of the temperature sensor on camshaft actuator B, bank 1, cannot be evaluated: an open line, a disconnected plug or a reading that fits no valid state. In the supplier list of NTN-SNR the letter B stands for the outlet camshaft, so the code targets an exhaust phaser turned by an electric motor whose electronics need heat protection. An Aisin patent mounts such a sensor on the motor control board and calls the intake shaft merely an example. We found no carmaker that publishes P34B4; the 2022 Mitsubishi Outlander, for instance, drives only its intake cam electrically and shifts the exhaust cam with an oil control solenoid. Expect restricted exhaust phasing until the circuit is repaired. Low and high faults: P34B6, P34B7.
- What you may notice
- Malfunction indicator lamp lit
- Exhaust cam timing on bank 1 fixed or limited
- Driving usually unaffected
- Likely causes
- LikelyPlug at the exhaust actuator not seated or wire broken
- PossibleTemperature sensor in the actuator electronics failed
- RareFaulty input stage in the controlling module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €50 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.